From the blocks of Algés and Linda-a-Velha to Paço de Arcos and Caxias, the Oeiras line lives in half-century-old flats — with windows the same age.
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78% of homes in Algés, Linda-a-Velha and Cruz Quebrada predate 1991, half from 1961-80 alone (2021 Census). Solid buildings with their original frames: thin aluminium, single glazing and completely uninsulated shutter boxes.
In the union of Oeiras, S. Julião, Paço de Arcos and Caxias, 50% of homes date from that wave alone (2021 Census) — among Greater Lisbon's highest concentrations. It's the line's typical flat, with its original window turning fifty.
Anyone working from home on the line hears the Marginal, the train and the street at once. Asymmetric acoustic glazing cuts around 42 dB — meetings without shutting yourself away, and nights without noise bridges.
In the line's buildings, the old shutter box is often the biggest thermal hole in the opening — worse than the glass itself. We replace window and insulated box in one go: the same opening stops having a hollow wall above it.
Choose the window type, glass and colour, and see the price without giving contact details. The final price is confirmed after a free measurement.
White PVC with double Low-E glazing, fitting and removal of the old frames included.
| Window type | Typical size | Installed, VAT incl. |
|---|---|---|
| Fixed window | 100×100 cm | €210–270 |
| Tilt-and-turn | 120×120 cm | €270–350 |
| Sliding window | 150×120 cm | €330–420 |
| Balcony door | 90×210 cm | €440–560 |
| Sliding door | 200×210 cm | €1,050–1,340 |
Figures from our calculator — adjust to your measurements for an exact estimate.
By home type, window type and the problem left behind.
Condensation solved 
Sealing and security 
Noise cut out 
Anthracite aluminium 
Kitchen with a view 
Full project Photos from our own completed jobs. We share more references from work near you during the on-site visit.
Representative examples of the homes and problems we solve most often around here.
The building is from 1968 and the windows are the originals. In winter the kitchen is the coldest room in the flat and the glass runs with water.
PVC with double Low-E glazing and an insulated shutter box. The kitchen stopped being off-limits in winter.
Chat on WhatsAppI work from home and my calls picked up the train and the Marginal. By day's end I'd repeated myself twice over.
Asymmetric acoustic glazing in the office and bedroom. Clean calls — and clean sleep.
Chat on WhatsAppThe flat is from the 1980s. The sliding windows have worked loose and the bedroom gets condensation on cold mornings.
Tilt-and-turn PVC with double glazing. No more play in the frames, no more condensation, and the room warms up fast.
Chat on WhatsAppWe bought a 3-bedroom flat to renovate. We wanted good windows without spending the kitchen budget.
White PVC with double Low-E glazing throughout, fitted in a day. The renovation's biggest upgrade, at appliance money.
Chat on WhatsAppWe also cover:
Our own team covers the whole municipality, from Algés to Paço de Arcos and Porto Salvo. We also cover western Lisbon, Cascais and Amadora.
JanelaFix · Praça de Londres 12, 4.º Dto, 1000-189 Lisboa · Mon–Fri, 8am–8pm, by appointment · Open in Google Maps
For a typical 2-bedroom flat in Algés, Linda-a-Velha or Paço de Arcos, a full replacement usually comes to between €1,800 and €3,200, with fitting, removal of the old frames and warranty included. The calculator gives you the figure in a minute, no contact details.
In most cases, yes. Asymmetric acoustic glazing cuts around 42 dB, against ~30 dB for a standard double unit — the train and the Marginal fade to background noise the microphone no longer picks up. If the façade is heavily exposed, we say so at the measurement and adjust the glass room by room.
It should — it's one of the highest-return parts. The old box is a hollow wall above the window: even with new glass it keeps leaking heat and whistling in the wind. We fit insulated boxes in the same opening, in the same installation, with the shutter (manual or electric) working as before.
The municipality is in winter climate zone I1, with a maximum Uw of 2.80 W/m²·°C (Decree-Law 101-D/2020 and Portaria 138-I/2021). Our PVC windows with double Low-E glazing sit well below that value.
It's not supposed to. The old frame comes out cut with care, the new one goes in made to the opening's exact size, and the finishing is done to preserve sills and surrounds. If a tile is already loose with age, we tell you before touching it — no surprises at the end of the job.
Still unsure between materials? Compare PVC and aluminium or see our aluminium windows.
Reply within one business day. No commitment and no large deposit.
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